Museums Director Mark Hall-Patton discusses accessibility at the Clark County Museum. The Clark County Museum is open every day except Thanksgiving, Christmas and New Year’s Day. The hours: 9 a.m. to 4:30 p.m. Entry is just $2 per person, except seniors and children, who are $1 each. The museum, the largest and oldest in the Las Vegas Valley, is located at 1830 S. Boulder Highway, Henderson, NV 89002-8502. For more information, please visit ClarkCountyNV.gov or call (702) 455-7955.